how to scroll on a div? scrollTop and offset.top not working for me.

how to scroll on a div? scrollTop and offset.top not working for me.

i have a master div named: myScroll

the css:
  1.          .myScroll {
  2.             overflow:  auto; 

  3.             height: 400px;
  4.          } 
and this Scroll have 28 divs (28 rows)
with ajax i fill each row, sometimes 1 div have 3 lines in other cases, 12 lines and so on.. (different number of lineS) (see image attached)
then i want move to a visible area and i try:

$(".myScroll").scrollTop($("divRow_" + idxTar).offset.top);

where:
var idxTar = $(this).data('id');

idxTar = Number of row

here a fiddle:



any advice how to do this job? thanks